Method, apparatus and computer program product for data synchronization

An apparatus for data synchronization, comprising:

• at least one processing unit;
• and
• at least one memory coupled to the at least one processing unit and storing instructions for execution by the at least one processing unit, the instructions, when executed by the at least one processing unit, causing the apparatus to perform acts comprising:
• obtaining a first bitmap provided for a first storage device, the first storage device including a group of storage areas, a bit in the first bitmap indicating whether data in a corresponding storage area of a first size in the group of storage areas is to be synchronized to a second storage device,
• in response to a configuration of the first storage device being changed, determining a second size of a storage area in the group of storage areas,
• converting the first bitmap into a second bitmap based on the first size and the second size, a bit in the second bitmap indicating whether data in a corresponding storage area of the second size in the group of storage areas is to be synchronized to the second storage device, and
• synchronizing, based on the second size and the second bitmap, data from the first storage device to the second storage device;
• wherein the first bitmap and first information about the first size are stored in a persistent storage device, and obtaining the first bitmap comprises:
• obtaining the first bitmap from the persistent storage device.

A computer program product having a non-transitory computer readable medium which stores a set of instructions to perform data synchronization;

• the set of instructions, when carried out by computerized circuitry of a storage system, causing the computerized circuitry to perform a method of:
• obtaining a first bitmap provided for a first storage device, the first storage device including a group of storage areas, a bit in the first bitmap indicating whether data in a corresponding storage area of a first size in the group of storage areas is to be synchronized to a second storage device;
• in response to a configuration of the first storage device being changed, determining a second size of a storage area in the group of storage areas;
• converting the first bitmap into a second bitmap based on the first size and the second size, a bit in the second bitmap indicating whether data in a corresponding storage area of the second size in the group of storage areas is to be synchronized to the second storage device;
• and
• synchronizing, based on the second size and the second bitmap, data from the first storage device to the second storage device;
• wherein the first bitmap and first information about the first size are stored in a persistent storage device, and obtaining the first bitmap comprises:
• obtaining the first bitmap from the persistent storage device.